Key Fob Relay Attack Deterrence via Motion Position Fusion
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Solution Overview
Problem
Key fob devices and mobile platforms are vulnerable to relay attacks, where unauthorized parties trick the system into believing the correct conditions for entry or activation are met, even when the fob is far away from the platform, due to limitations in existing wireless communication systems.
Innovation Solution
The system incorporates both motion and position information from the key fob device to determine valid requests for entry or activation, using a combination of low-frequency and RF transmitters/receivers, and a determination module that considers the fob's movement and proximity to the mobile platform to prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless communication systems use only position information to determine access, then ease of operation is improved, but security against relay attacks deteriorates
Solution Approach 1:
The system merges position information from wireless communication with motion information from the accelerometer sensor to create a multi-factor authentication mechanism. This combination allows the system to maintain ease of operation while significantly improving security against relay attacks by requiring both correct position and valid motion patterns.
Solution Approach 2:
The determination module acts as an intermediary that processes both position and motion information before granting access. It mediates between the wireless communication system and the access control decision, using motion data as an additional verification layer to prevent relay attacks while maintaining user convenience.
2Reliability
If the system requires both motion and position information, then security is improved, but device complexity increases
Solution Approach 1:
The key fob device uses its built-in accelerometer sensor to self-generate motion information without requiring external sensors or additional hardware in the vehicle. The device independently captures its own motion data and transmits it to the vehicle system, reducing overall system complexity while maintaining enhanced security.
Solution Approach 2:
The determination module is designed to handle multiple types of information (position and motion) and make comprehensive access decisions. This multi-functional approach consolidates processing logic into a single module that can evaluate different authentication factors, reducing the need for separate dedicated systems for each function.
3Reliability
If motion information is added to authentication, then reliability against relay attacks is improved, but loss of information processing increases
Solution Approach 1:
The system extracts only the essential motion characteristics from accelerometer data that are relevant to detecting relay attacks, such as motion patterns and acceleration profiles. By focusing on specific motion features rather than processing all raw sensor data, the system reduces information processing overhead while maintaining reliability.
Data Source
AI summary
A relay attack deterrence system includes a mobile platform including a plurality of mobile platform transmitter components and a mobile platform receiver component provided therein. The system further includes a fob device having a fob receiver component, a fob transmitter component, and a motion sensor component configured to produce motion information. The fob device is configured to receive, at the fob receiver component, one or more first signals from at least one of the plurality of mobile platform transmitter components and to selectably transmit, to the mobile platform receiver component, a second signal based on the motion information and position information derived from the one or more first signals.